C#•8mo ago

❔ Method either receive a disposable [context] or use a new one (EFCore - Blazor)

I'm in a blazor project where I wanna reuse some query functions. Basically sometimes I either 1. Wanna use the method on itself where it should create and dispose a new context created by the contextFactory. 2. Wanna use the method inside another method that already has a context, and just wanna pass it so it doesn't create an unneccesary one. What I currently thought of is this:

public async Task<Order?> GetOrderByUid(string uid, DbContext? context)
    {
        var db = context ?? await _contextFactory.CreateDbContextAsync();
        var order = await db.Orders
            ... Other Stuff ...
            .SingleOrDefaultAsync(o => o.Uid == uid);
        if (context is null) await db.DisposeAsync();
        return order;
    }

public async Task<Order?> GetOrderByUid(string uid, DbContext? context)
    {
        var db = context ?? await _contextFactory.CreateDbContextAsync();
        var order = await db.Orders
            ... Other Stuff ...
            .SingleOrDefaultAsync(o => o.Uid == uid);
        if (context is null) await db.DisposeAsync();
        return order;
    }

However I do not like the idea of manually disposing when a context is not passed. Are there any other ideas on how to approach this?

2 Replies

UltraWelfare•8mo ago

Instead of dealing with the context, another idea is splitting entirely the query on itself to only mess around with IQueryables so it can be reused: Could also be an extension method

private Task<Order?> QueryOrderByUid(IQueryable<Order> query, string uid) =>
        query
            ... Other Stuff ...
            .SingleOrDefaultAsync(o => o.Uid == uid);



public async Task<Order?> GetOrderByUid(string uid)
    {
        await using var db =  await _contextFactory.CreateDbContextAsync();
        return await QueryOrderByUid(db.Orders, uid);
    }

private Task<Order?> QueryOrderByUid(IQueryable<Order> query, string uid) =>
        query
            ... Other Stuff ...
            .SingleOrDefaultAsync(o => o.Uid == uid);



public async Task<Order?> GetOrderByUid(string uid)
    {
        await using var db =  await _contextFactory.CreateDbContextAsync();
        return await QueryOrderByUid(db.Orders, uid);
    }

Accord•8mo ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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❔ Method either receive a disposable [context] or use a new one (EFCore - Blazor)